Diseases
Scab is a group of crop diseases caused by fungi, actinomycetes, or plasmodiophoromycetes, manifesting as spots, ulcers, and deformations on vegetative and generative plant organs.
Mentioned in descriptions 12 064 varieties reference book.
Apple and pear scab affects leaves, flowers, ovaries, and fruits, manifesting as olive-colored spots with a velvety coating, which leads to fruit cracking and yield loss. In potatoes, several types of scab are distinguished: common scab, where ulcers appear on tubers, and powdery scab, characterized by the formation of warts that rupture into powdery ulcers, as well as root damage.
The development of the disease depends on environmental conditions: for fruit scab, high humidity and rainfall are favorable, while for potatoes, it depends on soil specifics (pH, temperature, and moisture). Varietal resistance is ensured by breeding based on major genes or their combinations. Absolutely immune varieties do not exist, so resistance often manifests as field resistance and depends on the climatic zone.
In variety trials, resistance is assessed visually using a scoring scale or in percentages under natural and artificial infection backgrounds. To increase the accuracy of breeding, molecular genetic marking is used, which allows for the detection of resistance genes by genotype, minimizing phenotypic evaluation errors.
Selection based on the description text, not official resistance ratings: such data is not available in registers. Mention indicates that the trait is discussed in the variety's sources; see the variety's profile for details on what is specifically stated.
Cucumis sativus L. · Cucumber
OOO 'AGROFIRMA PARTNER'
Malus domestica (Suckow) Borkh. · Apple
Neumuller Michael
Cucumis sativus L. · Cucumber
Zoldsegtermesztesi Kutato Intezet, H
Malus domestica (Suckow) Borkh. · Apple
Top Plant Vivai (IT)
Solanum tuberosum L. · Potato
Grocep S.I.C.A.
Cucumis sativus L. · Cucumber
John Pieter Schipper
Malus domestica (Suckow) Borkh. · Apple
STICHTING DLO-CENTRUM VOOR PLANTENVEREDELINGS-EN
Malus domestica (Suckow) Borkh. · Apple
Prof. Dr. Hanna Schmidt / Dr. Jutta Krüger in Bundesforschungsanstalt für gartenbauliche Pflanzenzüchtung
Solanum tuberosum L. · Potato
Bretagne-plants (FR)
Solanum tuberosum L. · Potato
Heinrich Böhm
Solanum tuberosum L. · Potato
Bretagne-Plants S.C.I.C.A.
Malus domestica (Suckow) Borkh. · Apple
Schniga GmbH (IT)
Malus Mill. · Apple
Hiraragi, Tadao|Masuda, Japan
Solanum tuberosum L. · Potato
BOERHAVE VOF
Solanum tuberosum L. · Potato
CECAB (FR)/Bretagne-plants (FR)
Malus domestica (Suckow) Borkh. · Apple
Solanum tuberosum L. · Potato
Wolfgang Walter
Solanum tuberosum L. · Potato
Station de Recherche du Comité Nord G.I.E.
Solanum tuberosum L. · Potato
Jack Dunnett
Solanum tuberosum L. · Potato
JAMES HUTTON LTD
Solanum tuberosum L. · Potato
Sloots Aardappelkweekbedrijf B.V.
Solanum tuberosum L. · Potato
Justus Böhm
Malus domestica (Suckow) Borkh. · Apple
Zima Jan, Louda Otto, Tupy Jaroslav,
Cucumis sativus L. · Cucumber
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